去掉obi，使用自写绳索

Assets/Obi/Editor/Resources/VoxelMaterial.shader

@@ -1,63 +0,0 @@
-Shader "Obi/VoxelMaterial" {
-
-	Properties {
-        _MainTex ("Base (RGB)", 2D) = "white" {}
-        _Size("Square size",Float) = 0.95
-        _InsideColor("Inside color",Color) = (1,1,1,1)
-        _OutsideColor("Outside color",Color) = (0,0,0,1)
-    }
-
-	SubShader { 
-
-		Pass {
-       
-			Cull Back 
-			Fog { Mode Off }
-
-            CGPROGRAM
-            #pragma vertex vert
-            #pragma fragment frag
-
-            #include "UnityCG.cginc"
-
-			struct vin{
-				float4 vertex   : POSITION;
-				fixed4 color    : COLOR;
-				float2 texcoord  : TEXCOORD0;
-			};
-
-            struct v2f {
-                float4 pos: POSITION;
-                fixed4 color    : COLOR;
-			   float2 texcoord  : TEXCOORD0;
-            };
-
-		   sampler2D _MainTex;
-            float _Size;
-            fixed4 _InsideColor;
-            fixed4 _OutsideColor;
-
-            v2f vert(vin v) {
-                v2f o;
-                o.pos = UnityObjectToClipPos (v.vertex);
-                o.texcoord = v.texcoord;
-			   o.color = v.color;
-                return o;
-            }
-
-            fixed4 frag(v2f i) : SV_Target {
-                
-                float2 centered = i.texcoord * 2 - 1;
-                float square = max(abs(centered.x), abs(centered.y)) - 0.05f/(2.0*1.4142);
-                float width = fwidth(square);
-                float alpha = smoothstep(_Size - width, _Size,  square);
-
-                return lerp(_InsideColor,_OutsideColor,alpha);
-            }
-
-            ENDCG
-        }
- 
-	} 
-}
-